1

Get it looked at:
Anytime somithing inside the knee causes irritation, the knee will swell. This is called an effusion. Effusions are not normal in a normal knee. At your age the two most common causes are a meniscus tear or some early cartilage damage. If it persists, you should see a md and get weight bearing xrays and likely a mri.
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6

Lots of possiblities:
Is the ankle fully healed. If it is, did it heal in good alignment. Could be compensating as a result of injury and putting abnormal stress on other structures of foot. See a podiatrist.
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13

Injury?:
Ankle issues in patients your age most commonly develop from a traumatic or overuse injury. Was there an injury or are you exercising/in training? Early treatment involves rest, ice, compression (with a brace or elastic wrap) and elevation. It's difficult to give you more advice without more information. If I can help, then join my care team at www.healthtap.com/dr-clarkeholmes
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15

Many possibilities:
Venous insufficiency, hypertension, kidney or cardiac issues, side effect of medications, h/o of ankle injury. There are many possibilities and hence a history and physical by your internist is a good idea.
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Swelling is the enlargement of organs, skin, or other body parts. It is caused by a buildup of fluid in the tissues. The extra fluid can lead to a rapid increase in weight over a short period of time (days to weeks). Swelling can occur all over the body (generalized) or only in one part of the body (localized).
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